- #1
Bacle
- 662
- 1
Hi, everyone:
I think this should be simple, but I've been stuck for a while now:
Let M be an n-manifold and N an n-dim. subspace of M, of possibly lower dimension
than M , then M is knotted, or N is a knot in M if there are non-isotopic
embeddings of N in M.
Now:
Say there are non-isotopic embeddings of N in M. How does this affect the
n-th homology of M (n is the dimension of M) ? . Does it follow that if
H_n(M)==0 , that there are no knots, i.e., there is only one isotopy class
of embeddings of N in M? And, conversely, if f,g, are two non-isotopic embeddings
of N in M, does it follow that H_n(M) is not trivial?
Thanks .
I think this should be simple, but I've been stuck for a while now:
Let M be an n-manifold and N an n-dim. subspace of M, of possibly lower dimension
than M , then M is knotted, or N is a knot in M if there are non-isotopic
embeddings of N in M.
Now:
Say there are non-isotopic embeddings of N in M. How does this affect the
n-th homology of M (n is the dimension of M) ? . Does it follow that if
H_n(M)==0 , that there are no knots, i.e., there is only one isotopy class
of embeddings of N in M? And, conversely, if f,g, are two non-isotopic embeddings
of N in M, does it follow that H_n(M) is not trivial?
Thanks .